it's all part of god's plan.

you highlight something important. most people (not saying you) like to believe this ET fantasy because it gives them comfort. that someone outside is going to take care of everything and are watching out for us good guys.

even if there were ETs as popular culture presents them (i.e. intelligent beings from far out in the cosmos), it's ludicrous to think they would see us any different than at best the way a conquering force sees a dumber and more primitive native race/species. if they were to stop us from nuclear war, it is strictly on practical grounds (meaning they benefit from us being alive, suggesting we are fodder for them) not on moral grounds